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Revision 209, 1.0 kB
(checked in by arjanmol, 5 years ago)
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Diagram items |
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Diagrams typically contain a diacanvas.Canvas. This Canvas contains a bunch of |
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items. Those items are one way or another related to some UML.Element. |
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In the UML module a class Presentation is defined. It defines the relation |
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between one Element and its Presentations. |
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In the UML module all relations between objects are presented as associations. |
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There are some conflicts that have to be resolved when using Presentation in |
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conjunction with diacanvas.CanvasItem: |
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The default signature of the methods connect() and disconnect() is slightly |
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different. |
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This is resolved by overriding connect() and disconnect() and let them act |
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the same way as UML.Element's. |
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The unlink() method is added to remove the item from the canvas. This should |
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be used in stead of disconnecting directly from the parent object. |
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A __unlink__ signal is added. |
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Element.presentation connects to '__unlink__' of Presentation.subject. |
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Note that the subject notifiers are not called during loading, since no |
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notifications are send during loading. |
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